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Make set_fs_{root,pwd} take a struct path

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In nearly all cases the set_fs_{root,pwd}() calls work on a struct
path. Change the function to reflect this and use path_get() here.

Signed-off-by: Jan Blunck <jblunck@suse.de>
Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jan Blunck 2008-02-14 19:34:39 -08:00 committed by Linus Torvalds
parent 6ac08c39a1
commit ac748a09fc
3 changed files with 20 additions and 24 deletions
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28
fs/namespace.c
View file

@ -1650,15 +1650,14 @@ asmlinkage long sys_mount(char __user * dev_name, char __user * dir_name,
* Replace the fs->{rootmnt,root} with {mnt,dentry}. Put the old values.
* It can block. Requires the big lock held.
*/
void set_fs_root(struct fs_struct *fs, struct vfsmount *mnt,
struct dentry *dentry)
void set_fs_root(struct fs_struct *fs, struct path *path)
{
struct path old_root;
write_lock(&fs->lock);
old_root = fs->root;
fs->root.mnt = mntget(mnt);
fs->root.dentry = dget(dentry);
fs->root = *path;
path_get(path);
write_unlock(&fs->lock);
if (old_root.dentry)
path_put(&old_root);
@ -1668,15 +1667,14 @@ void set_fs_root(struct fs_struct *fs, struct vfsmount *mnt,
* Replace the fs->{pwdmnt,pwd} with {mnt,dentry}. Put the old values.
* It can block. Requires the big lock held.
*/
void set_fs_pwd(struct fs_struct *fs, struct vfsmount *mnt,
struct dentry *dentry)
void set_fs_pwd(struct fs_struct *fs, struct path *path)
{
struct path old_pwd;
write_lock(&fs->lock);
old_pwd = fs->pwd;
fs->pwd.mnt = mntget(mnt);
fs->pwd.dentry = dget(dentry);
fs->pwd = *path;
path_get(path);
write_unlock(&fs->lock);
if (old_pwd.dentry)
@ -1697,12 +1695,10 @@ static void chroot_fs_refs(struct nameidata *old_nd, struct nameidata *new_nd)
task_unlock(p);
if (fs->root.dentry == old_nd->path.dentry
&& fs->root.mnt == old_nd->path.mnt)
set_fs_root(fs, new_nd->path.mnt,
new_nd->path.dentry);
set_fs_root(fs, &new_nd->path);
if (fs->pwd.dentry == old_nd->path.dentry
&& fs->pwd.mnt == old_nd->path.mnt)
set_fs_pwd(fs, new_nd->path.mnt,
new_nd->path.dentry);
set_fs_pwd(fs, &new_nd->path);
put_fs_struct(fs);
} else
task_unlock(p);
@ -1845,6 +1841,7 @@ static void __init init_mount_tree(void)
{
struct vfsmount *mnt;
struct mnt_namespace *ns;
struct path root;
mnt = do_kern_mount("rootfs", 0, "rootfs", NULL);
if (IS_ERR(mnt))
@ -1863,8 +1860,11 @@ static void __init init_mount_tree(void)
init_task.nsproxy->mnt_ns = ns;
get_mnt_ns(ns);
set_fs_pwd(current->fs, ns->root, ns->root->mnt_root);
set_fs_root(current->fs, ns->root, ns->root->mnt_root);
root.mnt = ns->root;
root.dentry = ns->root->mnt_root;
set_fs_pwd(current->fs, &root);
set_fs_root(current->fs, &root);
}
void __init mnt_init(void)

12
fs/open.c
View file

@ -490,7 +490,7 @@ asmlinkage long sys_chdir(const char __user * filename)
if (error)
goto dput_and_out;
set_fs_pwd(current->fs, nd.path.mnt, nd.path.dentry);
set_fs_pwd(current->fs, &nd.path);
dput_and_out:
path_put(&nd.path);
@ -501,9 +501,7 @@ asmlinkage long sys_chdir(const char __user * filename)
asmlinkage long sys_fchdir(unsigned int fd)
{
struct file *file;
struct dentry *dentry;
struct inode *inode;
struct vfsmount *mnt;
int error;
error = -EBADF;
@ -511,9 +509,7 @@ asmlinkage long sys_fchdir(unsigned int fd)
if (!file)
goto out;
dentry = file->f_path.dentry;
mnt = file->f_path.mnt;
inode = dentry->d_inode;
inode = file->f_path.dentry->d_inode;
error = -ENOTDIR;
if (!S_ISDIR(inode->i_mode))
@ -521,7 +517,7 @@ asmlinkage long sys_fchdir(unsigned int fd)
error = file_permission(file, MAY_EXEC);
if (!error)
set_fs_pwd(current->fs, mnt, dentry);
set_fs_pwd(current->fs, &file->f_path);
out_putf:
fput(file);
out:
@ -545,7 +541,7 @@ asmlinkage long sys_chroot(const char __user * filename)
if (!capable(CAP_SYS_CHROOT))
goto dput_and_out;
set_fs_root(current->fs, nd.path.mnt, nd.path.dentry);
set_fs_root(current->fs, &nd.path);
set_fs_altroot();
error = 0;
dput_and_out:

4
include/linux/fs_struct.h
View file

@ -20,8 +20,8 @@ extern struct kmem_cache *fs_cachep;
extern void exit_fs(struct task_struct *);
extern void set_fs_altroot(void);
extern void set_fs_root(struct fs_struct *, struct vfsmount *, struct dentry *);
extern void set_fs_pwd(struct fs_struct *, struct vfsmount *, struct dentry *);
extern void set_fs_root(struct fs_struct *, struct path *);
extern void set_fs_pwd(struct fs_struct *, struct path *);
extern struct fs_struct *copy_fs_struct(struct fs_struct *);
extern void put_fs_struct(struct fs_struct *);